strDeviceName is copied into a fixed-size intermediate buffer and then
into m_configuration.strDeviceName. snprintf always null-terminates,
making the zero-initialisation of buf unnecessary. Fixes
-Wstringop-truncation warnings.

The default branch left strLevel uninitialised, causing undefined
behaviour if an unknown log level was passed. Fixes
-Wmaybe-uninitialized warning.

…le_command

buflen was computed but never used. The || dispatch chain's
return value was discarded; wrapped in (void) cast to make the
short-circuit-for-side-effects intent explicit. Fixes
-Wunused-but-set-variable and -Wunused-value warnings.

g_strPort is only 50 bytes. In cec_process_command_line_arguments,
argv strings are unbounded; in main, devices[0].comm is a 1024-byte
buffer. Both strcpy calls risked overflow if the comm port name
exceeded 49 characters. Replaced with snprintf bounded to
sizeof(g_strPort).

sizeof(g_config.strDeviceName) keeps the bound tied to the struct
definition rather than a hard-coded value.

Truncation into fixed-size destination buffers is intentional.
GCC diagnostic pragmas suppress the warning at each call site.